scholarly journals The effects of elevated CO2 and nitrogen fertilization on stomatal conductance estimated from 11 years of scaled sap flux measurements at Duke FACE

2012 ◽  
Vol 33 (2) ◽  
pp. 135-151 ◽  
Author(s):  
E. J. Ward ◽  
R. Oren ◽  
D. M. Bell ◽  
J. S. Clark ◽  
H. R. McCarthy ◽  
...  
Keyword(s):  
Stomatal Conductance ◽  
Elevated Co2 ◽  
Nitrogen Fertilization ◽  
Sap Flux ◽  
Flux Measurements

Stand-scale transpiration estimates in a Moso bamboo forest: (I) Applicability of sap flux measurements

2010 ◽  
Vol 260 (8) ◽  
pp. 1287-1294 ◽  
Author(s):  
Tomonori Kume ◽  
Yuka Onozawa ◽  
Hikaru Komatsu ◽  
Kenji Tsuruta ◽  
Yoshinori Shinohara ◽  
...  
Keyword(s):  
Moso Bamboo ◽  
Bamboo Forest ◽  
Sap Flux ◽  
Flux Measurements ◽  
Moso Bamboo Forest

Elevated CO2 alleviates the impact of drought on barley improving water status by lowering stomatal conductance and delaying its effects on photosynthesis

2007 ◽  
Vol 59 (3) ◽  
pp. 252-263 ◽  
Author(s):  
Anabel Robredo ◽  
Usue Pérez-López ◽  
Hector Sainz de la Maza ◽  
Begoña González-Moro ◽  
Maite Lacuesta ◽  
...  
Keyword(s):  
Stomatal Conductance ◽  
Elevated Co2 ◽  
Water Status ◽  
The Impact

scholarly journals Response of in vitro Cultured Palm Oil Seedling Under Saline Condition to Elevated Carbon Dioxide and Photosynthetic Photon Flux Density

2012 ◽  
pp. 52-64
Author(s):  
Pet Roey Pascual ◽  
Krienkai Mosaleeyanon ◽  
Kanokwan Romyanon ◽  
Chalermpol Kirdmanee
Keyword(s):  
Stomatal Conductance ◽  
Net Photosynthetic Rate ◽  
Elevated Co2 ◽  
Photosynthetic Rate ◽  
Transpiration Rate ◽  
Pigment Contents ◽  
Salinity Levels ◽  
Oil Palms ◽  
Ambient Co2

Salt stress elicits various physiological and growth responses of oil palm. A laboratory experiment was conducted to determine the responses of oil palms cultured in vitro under varying salinity levels (0, 85.5, 171.11, 342.21 and 684.43 mM NaCl) to elevated CO2 (1000 μmol CO2/mol) and PPFD (100±5 μmol m-2s-1) in terms of growth characteristics, pigment contents and photosynthetic abilities. After 14 days of culture, net photosynthetic rate (μmol CO2 m-2s-1) of oil palms across varying salinity levels was 5.33 times higher than those cultured under ambient CO, (380±100 Mmol CO2/mol) and PPFD (50±5 μmol m-2s -1). At increased net photosynthetic rate (elevated CO2 and PPFD), despite having no significant difference in pigment contents (chlorophyll a, chlorophyll b, total chlorophyll and carotenoid) between different CO2 and PPFD levels, dry weight and percent dry matter were 0.26 and 0.11 times higher, respectively, as compared to those cultured under ambient CO2 and PPFD. In the same elevated CO2 and PPFD level, across all salinity levels, stomatal conductance was 0.30 times lower than those cultured under ambient CO2 and PPFD. At reduced stomatal conductance (elevated CO2 and PPFD), transpiration rate was also reduced by 0.30 times. Thus with increased net photosynthetic rate and reduced transpiration rate, water use efficiency was increased by 7.22 times, across all salinity levels, than those cultured at ambient CO2 and PPFD. These were considered essential for NaCl produces iso-osmotic stress.

Assessment of canopy stomatal conductance models using flux measurements

2009 ◽  
Vol 220 (17) ◽  
pp. 2115-2118 ◽  
Author(s):  
Shusen Wang ◽  
Yan Yang ◽  
Alexander P. Trishchenko
Keyword(s):  
Stomatal Conductance ◽  
Flux Measurements ◽  
Canopy Stomatal Conductance

Responses in stomatal conductance to elevated CO2 in 12 grassland species that differ in growth form

Vegetatio ◽  
1996 ◽  
Vol 125 (1) ◽  
pp. 31-41 ◽  
Author(s):  
Alan K. Knapp ◽  
Erik P. Hamerlynck ◽  
Jay M. Ham ◽  
Clenton E. Owensby
Keyword(s):  
Stomatal Conductance ◽  
Elevated Co2 ◽  
Growth Form ◽  
Grassland Species

scholarly journals Carbon and oxygen isotope analysis of leaf biomass reveals contrasting photosynthetic responses to elevated CO<sub>2</sub> near geologic vents in Yellowstone National Park

2009 ◽  
Vol 6 (1) ◽  
pp. 25-31 ◽  
Author(s):  
S. Sharma ◽  
D. G. Williams
Keyword(s):  
Stomatal Conductance ◽  
Oxygen Isotope ◽  
Elevated Co2 ◽  
National Park ◽  
Photosynthetic Capacity ◽  
Lodgepole Pine ◽  
Leaf Biomass ◽  
Carbon And Oxygen Isotope ◽  
Co2 Levels ◽  
Photosynthetic Responses

Abstract. In this study we explore the use of natural CO2 emissions in Yellowstone National Park (YNP) in Wyoming, USA to study responses of natural vegetation to elevated CO2 levels. Radiocarbon (14C) analysis of leaf biomass from a conifer (Pinus contortus; lodgepole pine) and an invasive, non-native herb (Linaria dalmatica; Dalmation toadflax) was used to trace the inputs of vent CO2 and quantify assimilation-weighted CO2 concentrations experienced by individual plants near vents and in comparable locations with no geologic CO2 exposure. The carbon and oxygen isotopic composition and nitrogen percent of leaf biomass from the same plants was used to investigate photosynthetic responses of these plants to naturally elevated atmospheric CO2 concentrations. The coupled shifts in carbon and oxygen isotope values suggest that dalmation toadflax responded to elevated CO2 exposure by increasing stomatal conductance with no change in photosynthetic capacity and lodgepole pine apparently responded by decreasing stomatal conductance and photosynthetic capacity. Lodgepole pine saplings exposed to elevated levels of CO2 likewise had reduced leaf nitrogen concentrations compared to plants with no enhanced CO2 exposure, further suggesting widespread and dominant conifer down-regulated photosynthetic capacity under elevated CO2 levels near geologic vents.

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